Improvement in sprinkling-pipes



I Inrrnn STATES PATENT -OFFIGE.

"FREDERIGDK'GRINNELL, on ruovmnuon, Radon isnnun.

IMPROVEMENT IN SPR lN KLlNG -Pl P-Es;

Specification forming part of Letters Patent No. 201,242, dated March 12, 1878 application filed November 6, 1877.

To all whom it may concern Be it known that I, FREDERICK GRINNELL, of the city and county of Providence, in the State of Rhode Island, have invented certain new and useful Improvements Relating to sprinkling-Pipes, of. which the following is a s specification:

It has become common, andis esteemed a wise precautionary measure against fire, to arrange the several branches of the pipes; but the success of the operation depends upon keeping the holes of a uniform small size. The pipes are usually of iron. If the holes are too large, the water will all escape in the lower part of the building, or in the beginning of a pipe or section, and will not maintain a high pressure to the top and to the extreme corners of the building. If, on the contrary, oxidation or other cause contracts the holes too much, the operation is entirely defeated.

Iron is cheap and strong. Economy forbids the use of brass or similar metals for the bodies of the pipes; but I have devised the bushing of holes in an iron pipe with brass or analogous non-corrodible metal, so as to combine the advantages of an iron with that of a brass pipe.

I produce, by machinery or otherwise, a great number of small washers or thin rings of brass or analogous non-corrodible material, and insert these and strongly confine them, by cheap and ready means, in holes formed too large in the iron pipes.

The following is a description of what I consider the best means of carrying out the invention.

In the accompanying drawings, forming apart of this specification, Figure 1 is a magni- Similar letters of reference indicate like parts in both figures.

A is the iron pipe, and a. is a large hole, drilled partly through from the outside. The hole is continued through of less diameter, as indicated by a. B is a washer of hard brass, having a small and smoothly-punched hole in the center.

To set the washer, it is pushed down to its place by hand or by machinery, to rest on the shoulder at the junction of the large hole a with the small hole a. After it is firmly set down to its proper position, the metal on the exterior of the pipe A adjacent to the hole a is slightly crushed by a blow with a hammer, or by other suitable means, so as to slightly rivet the adjacent iron A over the edge of the washer B. This effectually and permanently confines it.

When the water is admitted to the interior of the pipe it issues with full force through the small smooth hole in the center of the washer B. The riveting holds the washer against escaping.

So long as no occasion for the use of the ap paratus occurs, or equally after such occurrence, it remains in good condition for use.

The hole a isso much larger than the hole..

in the center of the washer B that a considerable oxidation may occur without obstructing or materially afiecting the How of the water.

So long as a suificient orifice of any form remains open to allow the water from the interior of the pipe to reach the washer B with itsfull pressure, the jet will issue with full force.

The brass or analogous material of the Washer I Bis not subject to corrosion or other change.

My improved sprinkling-pipes require litin g in the metal, I believe I can hold the washer means A for firmly confining the Washer; as herein specified.

"In testimony whereof I have hereunto set my name in presence of two subscribing witnesses.

FREDERICK GRINNELL.

Witnesses:

PHILLIPS ABBOTT, A. HENRY GENTNER. 

